Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 34: Poster: Ultra-cold atoms, ions and BEC (with Q)
A 34.4: Poster
Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais
statistical evaluation of ultracold molecular fraction rate — •tomotake yamakoshi1, shinichi watanabe1, chen zhang2,3, and chris greene2,3 — 1Department of Engineering Science,University of Electro-Communications, Tokyo, Japan — 2Department of Physics and JILA, University of Colorado, Colorado, USA — 3Department of Physics, Purdue University, Indiana, USA
In recent years, various ultracold molecule production experiments have been carried out. Molecules are formed via a field ramp through a Fano-Feshbach resonance (FFR). They are subsequently transferred to the rovibrational ground state by STIRAP with very high efficiency. In this scenario, the final molecule conversion rate is restricted by the FFR fractional conversion. We study the FFR molecular fractional conversion rate using a Monte Carlo simulation based on the stochastic phase space sampling (SPSS) model[1]. The key idea of SPSS is that the phase space volume of atomic pairs does not change during an adiabatic magnetic sweep. We have applied this method to Fermi-Fermi, Bose-Bose, and Bose-Fermi cases, and have compared our SPSS result with that of the equilibrium theory[2]. We have identified some differences between results of the two approaches[3], especially in ultracold regions that have not yet been experimentally realized.
References: [1] E. Hodby et al., Phys. Rev. Lett. 94, 120402 (2005) [2] S. Watabe and T. Nikuni, Phys. Rev. A 77, 013616 (2008). [3] T. Yamakoshi, S. Watanabe, C. Zhang, C. H. Greene, Phys. Rev. A 87, 053604 (2013).